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Effect of Pressure on the Intermediate-valence Semiconductor SmB6 : 11B-NMR
Kohei Nishiyama,Takeshi Mito,Ko-ichi Ueda,Takehide Koyama,Takao Kohara,Gabriel Prist´aˇs,Slavom´ır Gab´ani,Mari´an Reiffers,Karol Flachbart,Yasuhiro Komaki,Mitsutane Kokubu,Hideto Fukazawa,and Yoh Koh 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
We report the first high-pressure 11B-NMR studies above 3 GPa on the intermediate-valencesemiconductor SmB6. A 11B-NMR line obtained at 4.9 GPa, the highest pressure for the measurements,and at 1.9 K shows quite similar a line shape to that at ambient pressure, indicating nostructural or magnetic phase transition up to this pressure. The temperature dependence of thespin lattice relaxation rate 1/T1 at 4.9 GPa still exhibits an activation-type temperature dependencecharacteristic of semiconductors, which reveals an obvious decrease in the insulating gap byabout 30% compared to the gap at ambient pressure. The present experimental facts of a finiteinsulator gap and no magnetic order at 4.9 GPa are consistent with recent transport measurementsperformed under better hydrostatic pressures.
Aida, Shin,Nishiyama, Yasuhiro,Kakiuchi, Kiyomi,Hoffmann, Norbert,Fon, Adeline,Oelgemoller, Michael Korean Society of Photoscience 2013 Rapid communication in photoscience Vol.2 No.3
Acetone sensitized photoadditions of isopropanol to (5R)-5-menthyloxy-2-(5H)-furanone were investigated in two different microflow reactor systems. Setup A employed a commercially available glass reactor under a UVB-panel. Setup B utilized a FEP microcapillary wrapped tightly around a Pyrex cylinder with a single UVB fluorescent tube at its center. The reactions under flow conditions were subsequently compared to analogue reactions conducted in a batch chamber reactor. Overall, the microflow systems gave faster conversions and higher isolated yields. The flexible microcapillary setup, however, showed the best performance and promise in terms of future scale-up and reactor optimization.
Tomiki Sumiyoshi,Yasuhiro Kawasaki,Michio Suzuki,Yuko Higuchi,Shimako Nishiyama,Masayoshi Kurachi 대한정신약물학회 2008 CLINICAL PSYCHOPHARMACOLOGY AND NEUROSCIENCE Vol.6 No.2
Research into first episode psychosis (FEP) is a growing field in psychiatry. In this paper, the authors provide an overview of neurocognitive findings and therapeutic approaches indicated for patients with FEP. Focus will be placed on evidence from neuropsychological assessment and brain imaging of electrophysiological activities, as well as the ability of some psychotropic drugs, such as second generation antipsychotics, to improve functional outcome. Efforts to identify biological signals characteristic of FEP are expected to facilitate early intervention into schizophrenia and related disorders.
Efficacy of holmium laser enucleation in patients with a small (less than 30 mL) prostate volume
Ichiro Tsuboi,Yuki Maruyama,Takuya Sadahira,Nobuyoshi Ando,Yasuhiro Nishiyama,Motoo Araki,Takushi Kurashige,Takaharu Ichikawa,Ryoji Arata,Noriaki Ono,Toyohiko Watanabe,Syunji Hayata,Hiroaki Shiina,Yas 대한비뇨의학회 2021 Investigative and Clinical Urology Vol.62 No.3
Purpose: To evaluate the efficacy of holmium laser enucleation of the prostate (HoLEP) in patients with a small prostate volume (≤30 mL). Materials and Methods: We retrospectively evaluated 1,135 patients who underwent HoLEP at two institutions between July 2007 and March 2020. Patients who were not evaluated for the International Prostate Symptom Score (IPSS) before or after HoLEP were excluded. We divided patients into two groups according to estimated prostate volume (ePV): ≤30 (n=198) and >30 mL (n=539). The patient characteristics, IPSS, peak urinary flow rate (Qmax), postvoid residual urine volume (PVR), and other data were compared before and after surgery in each group and between the two groups. Multivariate analysis was performed to identify the factors associated with the efficacy of HoLEP in the group with ePV ≤30 mL. Results: A total of 737 patients were included in this retrospective study. ePV (23.4 mL vs. 50 mL; p<0.001) and PVR differed significantly between the two groups. The IPSS, IPSS-quality of life, PVR, and Qmax significantly improved after HoLEP in both groups. Improvements in the IPSS, IPSS-quality of life, Qmax, and PVR were greater in the >30 mL group (p<0.001), whereas operation time and morcellation time were significantly shorter in the ≤30 mL group. In the multivariate analysis, age <70 years was independently associated with improvement by HoLEP. Conclusions: HoLEP is an effective treatment for patients with a small prostate, even though the extent of improvement after HoLEP was greater in those with a larger prostate.